XL: Add new metadata for checksum. (#1743)

xl-v1-object.go

@@ -37,8 +37,6 @@ func (xl xlObjects) GetObject(bucket, object string, startOffset int64) (io.Read
 		return nil, toObjectErr(err, bucket, object)
 	}
 
-	totalObjectSize := xlMeta.Stat.Size // Total object size.
-
 	// Hold a read lock once more which can be released after the following go-routine ends.
 	// We hold RLock once more because the current function would return before the go routine below
 	// executes and hence releasing the read lock (because of defer'ed nsMutex.RUnlock() call).
@@ -47,7 +45,7 @@ func (xl xlObjects) GetObject(bucket, object string, startOffset int64) (io.Read
 		defer nsMutex.RUnlock(bucket, object)
 		for ; partIndex < len(xlMeta.Parts); partIndex++ {
 			part := xlMeta.Parts[partIndex]
-			r, err := xl.erasureDisk.ReadFile(bucket, pathJoin(object, part.Name), offset, totalObjectSize)
+			r, err := xl.erasureDisk.ReadFile(bucket, pathJoin(object, part.Name), offset, part.Size)
 			if err != nil {
 				fileWriter.CloseWithError(err)
 				return
@@ -96,8 +94,7 @@ func (xl xlObjects) getObjectInfo(bucket, object string) (objInfo ObjectInfo, er
 	// Count for errors encountered.
 	var xlJSONErrCount = 0
 
-	// Loop through and return the first success entry based on the
-	// selected random disk.
+	// Return the first success entry based on the selected random disk.
 	for xlJSONErrCount < len(xl.storageDisks) {
 		// Choose a random disk on each attempt, do not hit the same disk all the time.
 		disk := xl.getRandomDisk() // Pick a random disk.
@@ -314,7 +311,7 @@ func (xl xlObjects) deleteObject(bucket, object string) error {
 	wg.Wait()
 
 	var fileNotFoundCnt, deleteFileErr int
-	// Loop through all the concocted errors.
+	// Count for specific errors.
 	for _, err := range dErrs {
 		if err == nil {
 			continue